together automotive an innovation moves forward, ignition systems are becoming an ext and more entangled with other systems top top the engine. The present generation Nissan Maxima 3.5L V6, which was presented in 2004, has a relatively conventional coil-on-plug (COP) ignition system. The separation, personal, instance coils are driven by the powertrain manage module (PCM) using the intake signal from the crankshaft position (CKP) sensor as the primary timing trigger. But what makes this system various from rather you may be familiar with is that the PCM additionally uses input signals from the two camshaft position (CMP) sensors (one for each cylinder bank) to modify spark timing. Nissan likewise refers to the camshaft position sensors together “PHASE” sensors (for electronic came phasing, ns assume).

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Spark timing on the 3.5L engine is nonadjustable and also is regulated by the computer. You have the right to read the timing on a scan tool, or if you choose to carry out things the old fashioned way, you have the right to actually check the spark timing on this engine with a time light. The capture is you an initial have to eliminate the #1 COP ignition coil (the first cylinder top top the behind bank) and insert a plug wire in between the coil and also spark plug. Climate you can clamp your inductive pickup onto the plug wire and also observe the time marks ~ above the crankshaft pulley. The timing spec for this engine is 15° plus or minus 5° BTDC (Before height Dead Center). The idle spark timing have the right to vary rather a bit depending on what the PCM thinks the engine needs based upon operating conditions.
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for this reason what wake up if you examine the timing and also see the it’s outside the specs? Nissan has a unique procedure because that this dubbed the “Idle waiting Volume Learning” procedure. The 2004 and newer 3.5L V6 engines room throttle-by-wire, for this reason the PCM will vary spark time according to accelerator position, idle speed and also airflow right into the engine. Nissan says the Idle waiting Volume learning procedure should be done anytime the PCM or digital throttle manage actuator is replaced, or whenever the ignition timing or idle speed are not within specifications. Nissan also recommends act this procedure anytime an engine has a stalling difficulty or one erratic idle issue.
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prior to you deserve to do this procedure, the engine and transmission fluid must it is in warm. The coolant temperature have to be above 158° F, and also the automobile should be moved for 10 minute or an ext to warm up the infection fluid. The charging mechanism must be placing out 12.9 volts or more at idle, the gear shift selector must be in Park or Neutral, and all the lights and accessories (A/C, heater, radio, etc.) should be off. Top top vehicles v daytime headlights, applying the parking brake prior to the engine is began will protect against the headlamps from transforming on.

The easiest method to execute the Idle air Volume learning procedure is with the Nissan Consult-II manufacturing facility scan tool. All you execute is choose the test, touch Start and wait until the scan tool screens “CMPLT” for test complete. You have the right to then rev up the engine a pair of times and recheck the timing and idle speed to make certain they are currently within specifications.
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there is also a hands-on procedure because that doing the Idle wait Volume discovering procedure if girlfriend don’t have actually a Nissan manufacturing facility scan device handy:

through the engine and also transmission warmed up, turn off the key and wait at least 10 seconds.

check that accelerator pedal is completely released, rotate on the ignition switch and also wait 3 seconds.

Repeat the following easily five times within 5 seconds:

– completely depress the accelerator pedal.

– fully release the accelerator pedal.

Wait seven seconds, then fully depress the accelerator pedal and hold it for roughly 20 secs until the MIL stop blinking and turns on.
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totally release the accelerator pedal in ~ three seconds after the MIL transforms on.

start engine and also let that idle.

Wait 20 seconds.

Rev up the engine 2 or 3 times and make certain that idle speed is 625 rpm plus or minus 50 rpm, and also that spark time is 15° plus or minus 5° BTDC. If idle rate or ignition timing space not in ~ specs, you’ve got a problem. Inspect the throttle valve come make certain it is completely closed. Inspect the PCV valve (make certain it rattles and is suck vacuum). Examine for any air leaks downstream of the throttle. If no troubles are found, check all the wiring exploit connectors to the accelerator actuator, and also check throttle position sensor and also airflow sensors for feasible faults.
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Misfire Codes If the MIL is on and you uncover a P030X misfire code for a details cylinder, the fault might be a fouled spark, a poor ignition coil or even a shed valve. Watch coil locations in figure 1. Chances are the misfire might be a negative coil because Nissan has had a background of coil issues on the vault generation Maxima.

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~ above the 2001-’03 Maximas, coil failure at family member low mileages (60,000 to 70,000 miles) room not uncommon. Nissan has not recognized the problem and also has no issued a technical business bulletin around the coil failures. However they carry out recommend replacing all six coils if one fails. Why? due to the fact that when one coil fails, chances are another will fail no too much down the road. The coils cost around $85 each, and the part number is 224488J115.

These previously generation coils also have had a trouble with RFI (Radio Frequency Interference) leading to static top top the automobile radio. Nissan issued a bulletin NTB01-073B, date March 1, 2002, spanning 2002 Maxima, Altima and Sentra models.

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The bulletin claims the cause of a steady, rhythmic ticking or popping noise in the radio speaker that complies with engine rate on specific FM radio stations have the right to be led to by the ignition coil resistors (which are situated inside the ignition coil tube that fits under over the spark plug).

To obtain to the coils on the 2002 engines, it is only crucial to separate the entry collector indigenous the intake manifold as shown in figure 2 on web page 18. You carry out not have to remove the throttle body indigenous the entry collector or drainpipe the radiator. The resistors inside the coil tubes can then be replaced by pulling the rubber boots away indigenous the ignition coil. Then twist and pull the ignition coil pipe to separate it indigenous the coil. The old resistor assembly inside deserve to then be replaced with the new resistor as presented in figure 3.

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~ above the current generation Maximas, a different style of COP coil is used and failures have actually not to be an issue (at the very least not yet) — i m sorry is a great thing because the coils are harder to replace. If you have to adjust one (or every six), here’s the procedure:

remove the plastic engine cover.

drainpipe the radiator.

Disconnect the fixed air flow sensor electric connector and remove the air cleaner assembly and air entry tubes.

eliminate the entry manifold collector, gasket and electric throttle manage actuator.

change the coil(s). The ignition coils for the present Maximas room also around $85 each, and also the typical labor to change all 6 is 2.2 hours according come Nissan. The part number is 224488J115.
Spark Plugs The factory-installed spark plugs in the 2004 and also up Maximas space PLFR5A-11 NGK platinum plugs v a 100,000-mile organization interval. The electrode void is 1.1 mm (0.043”). If a cylinder misfire is due to a worn, fouled or shorted spark plug, girlfriend still need to go v the very same coil removal procedure due to the fact that the plugs are hidden down under the coils. You’ll need a magnetic spark plug socket and a long extension to extract them from the holes in the valve covers.

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analysis the plugs is still a beneficial diagnostic practice for seeing what’s actually going on within the burning chamber. And, Nissan’s 3.5 V6 engines have actually a pretty basic firing order. See figure 4. If a plug is wet, it way the coil isn’t firing. If the electrodes and insulator ~ above the plug are covered v black soot, the cylinder is running as well rich (possibly a leaky fuel injector, or maybe a sticky fuel push regulator or poor O2 sensor if every the plugs are carbon fouled). If the plugs have wet, oily carbon deposits, the engine is burn oil. The many likely reason would it is in worn intake valve guides and also seals, or probably worn or damaged piston rings. Oil burning have the right to not just foul the plugs, but additionally cause a buildup of heavy carbon deposits on the intake valves and inside the burning chamber. This, in turn, may reason hesitation problems when accelerating, or perhaps spark hit (detonation).

Knock Sensor The Maxima engine needs premium fuel, however will additionally run on lower octane gas due to the fact that it has actually a knock sensor (located in the middle top of the engine under the intake plenum). If the hit sensor detects spark knock when the engine is under load, it will certainly send a signal come the PCM to retard spark timing. There shouldn’t be any spark hit if the punch sensor is doing that job and also there is no too hefty a buildup the carbon in the combustion chambers or on the top of the pistons. If an engine has a spark hit issue, therefore, the problem could be a defective punch sensor or a heavy buildup that carbon in the engine. If switching to 91 octane gas doesn’t eliminate the problem, and also the knock sensor is generating a signal, the carbon needs to be eliminated from the engine through a height Cleaner treatment.
girlfriend can examine the hit sensor by looking at the scan tool to check out if is generating a signal, or by measure up the resistance in between knock sensor terminal 1 and ground. A an excellent knock sensor must measure 532-588 kOhms at room temperature. Nissan claims to handle the knock sensor carefully since it have the right to be damaged if it is dropped ~ above a tough floor. If you must replace a knock sensor on a 2004 or more recent Maxima, the part number is 220607S000. The part costs around $95 and also takes 2.6 hrs labor come replace since of its hidden location (the height of the input manifold needs to come off).
No Start, No Spark If you conference a Maxima the won’t start, the fault might be no spark or it could be no fuel. A quick way to find out is to spray some starting fluid into the throttle or wait intake and also see if the engine starts. If it starts and runs a couple of seconds, then dies, the problem is no fuel (bad fuel pump, fuel pump relay or a leaky fuel push regulator). If the does no start, the PCM may not be acquiring a great rpm signal native the crank position sensor.

The crank sensor, i beg your pardon Nissan refers to as a “POS” (position sensor), is located on the oil pan, is a magnetic sensor with a Hall result chip inside that converts the AC signal come a digital rpm signal. There room no resistance specs because that this sensor various other than zero (on) and also infinite (off). You have the right to use your scan tool or a border to watch if the sensor is generating an rpm signal once the engine is cranking, or a noid irradiate to inspect for a digital signal output. If the sensor is bad and you need a new one, the part number is 23731AL60C and the expense is about $70.

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an additional component in the ignition device that may cause a no start due to the fact that of no spark is the ignition device relay (located in the underhood relay center together with the fuel pump, cooling fan, starter, PCM and also headlight relays). An open relay will kill strength to the ignition coils.

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The ignition system additionally has a condenser in the circuit that runs native the PCM relay to the ignition coils. A shorted condenser could additionally ground the end the ignition circuit bring about a no start. The condenser have the right to be confirm by measuring the resistance in between terminals 1 and also 2. A an excellent condenser should have actually 1M Ohms or more of resistance.
Nissan has a bulletin out for a difficult hot beginning problem on the 3.5L V6 in the at an early stage 2004 Maxima and also Quest, and also 2003-’04 Altima models. The symptom it explains is an engine the starts yes cold, but is difficult to begin after it has been driven. The examine engine light may or might not it is in on, and also DTC password P0340 (CMP sensor bank 1) and/or P0345 (CMP sensor bank 2) may be present. See number 5. In any type of event, Nissan claims the fix is to replace one or both camshaft place sensors. The part number of the rear financial institution (bank 1) CMP sensor is 23731-65906, and also the front financial institution (bank 2) CMP sensor is 23731-Al616. The CMP sensors room the same kind as the CKP sensor, and likewise cost around $70 each.